Transport is Australia’s and source of emissions, accounting for 23% of the total. Without intervention, transport is to be the leading source of emissions by 2030.
Authors
Hussein Dia
Professor of Future Urban Mobility, Swinburne University of Technology
Dorsa Alipour
PhD Candidate, Swinburne University of Technology
Hadi Ghaderi
Associate Professor in Logistics and Supply Chain Management, Swinburne University of Technology
Transport emissions from 2022 to 2023. Emissions from on-road diesel, which dominates the freight sector, were up by 3.7%.
Diesel vehicle numbers (passenger, light commercial, freight and buses) in Australia have since 2014, compared to 5% for petrol vehicles. Passenger cars account for 44% of all and freight trucks 23%.
One of the quickest ways to is to . It’s to do for cars. Trucks are a .
To find out how best to decarbonise trucks in Australia, our evaluated the from trucks. We focused on and trucks. We also compared their performance to diesel trucks five types of and three types of trucks.
show electric trucks are the better, faster option to decarbonise road freight by the target dates for emission cuts. In some cases, hydrogen trucks had two to three times the (the amount of greenhouse gases emitted per kilometre travelled) of electric trucks.
Why is a lifecycle analysis needed?
In the race to rapidly decarbonise road freight, it’s important to identify the most efficient and cost-effective technology.
Electric and hydrogen trucks both have zero tailpipe emissions. However, we must consider their full lifecycle to assess overall carbon footprints. The production, use and recycling phases of the two kinds of trucks produce different emissions.
use batteries that are charged directly from a power source. The cleaner the electricity source, the lower the emissions.
also have , though smaller than in electric trucks, but rely mainly on fuel cells powered by hydrogen to produce electricity that drives the wheels.
Currently, of the world’s hydrogen comes from . This results in large emissions.
Hydrogen can be produced using renewables to power a process of that extracts it from water. But this involves , each with energy penalties and losses.
Hydrogen storage tanks and delivery equipment are also needed. These are and at each step in the supply chain. On average, of the source energy remains to drive the wheels of a hydrogen truck, compared to for battery electric trucks.
What did the study look at?
We analysed lifecycle emissions for freight trucks in eight different scenarios of renewable energy mixes and adoption rates.
First, the considers emissions from fuel and electricity production using primary energy sources (fossil fuels and renewables).
It also takes into account emissions from making trucks. This phase includes extracting raw materials, processing, production and truck assembly.
In the operations phase, we consider emissions from driving, maintenance and servicing.
Finally, our analysis evaluates end-of-life emissions from repurposing components, recycling materials and disposal.
What did we find?
We applied the widely used lifecycle analysis model, to Australian conditions.
We first modelled a baseline scenario. It reflected Australia’s 2019 energy mix, truck fleet composition and validated travel distances for each truck type.
We then modelled eight scenarios with different energy mixes of fossil fuels and renewables. (Click for full details.)
The scenarios also included different mixes of diesel, electric and hydrogen trucks. We modelled and the impacts on emissions.
As expected, that combined high rates of renewable energy and adoption would lead to lower emissions than other scenarios.
Under a fully renewable scenario with 50% electric and 30% hydrogen trucks, freight emissions would fall by 76%, from 24.68 million tonnes (Mt) to 5.89 Mt.
In all scenarios with fossil fuels in the energy mix, hydrogen trucks had a higher lifecycle emissions intensity than electric trucks. In some cases, hydrogen trucks produced roughly three times the emissions of electric trucks.
Our findings highlight the challenge of cutting emissions from manufacturing, maintenance and disposal. On average, they account for 90 grams per kilometre for electric trucks and 40g/km for hydrogen trucks.
If we don’t cut these emissions, they end up accounting for a big share of lifecycle emissions. For example, in the 2033 energy mix scenario they would account for 79% of emissions for electric trucks and 39% for hydrogen trucks.
Emissions from making and disposing of batteries will likely fall as evolves to aid .
Is the industry ready for the transition?
We also conducted an online involving 40 small, 60 medium and 30 large trucking organisations.
Around 47% of participants rated their knowledge of electric and hydrogen trucks as basic, 42% as intermediate and 11% as advanced.
About 62% of operators said they had a formal decarbonisation strategy. Those with larger fleet sizes and/or involved in long-haul trucking were more committed to decarbonisation.
Only seven out of 130 participants were ready to absorb the higher purchase cost of low-emissions trucks. Most thought customers would not be willing to pay more for green freight services. They viewed high upfront purchase costs, total ownership costs and a lack of supporting infrastructure as barriers to adoption.
The road ahead
To overcome these barriers and speed up the shift to low-emissions trucks, a mix of interventions and is needed.
Global in truck manufacturing will make more suitable models and a variety of sizes and . Tighter emission , government and industry investment in such as and such as subsidies will also help.
Another barrier is uncertainty about performance and costs. Independent , field testing and will reduce this uncertainty and help operators and policymakers with their decisions.
Finally, our findings show fleet decarbonisation on its own is not an entirely effective strategy to cut emissions. It needs to be part of a holistic approach to cut emissions . This includes through measures such as and taxation, shifting road freight to and how we distribute freight.
Without these measures, Australia’s dependence on fossil fuels will deepen. Reaching our emission targets will become even harder.
Hussein Dia receives funding from the Australian Research Council, the iMOVE Australia Cooperative Research Centre, Transport for New South Wales, Queensland Department of Transport and Main Roads, Victorian Department of Transport and Planning, and Department of Infrastructure, Transport, Regional Development, Communications and the Arts.
This research is funded by iMOVE CRC and supported by the Cooperative Research Centres program, an Australian Government initiative.
Dorsa Alipour acknowledges the PhD scholarship and financial support she is receiving from Swinburne University of Technology.
Hadi Ghaderi receives funding from the iMOVE Cooperative Research Centre, Transport for New South Wales, Queensland Department of Transport and Main Roads, Victorian Department of Transport and Planning, Department of Infrastructure, Transport, Regional Development, Communications and the Arts, IVECO Trucks Australia limited, Innovative Manufacturing Cooperative Research Centre, Victoria Department of Education and Training, Australia Post, Bondi Laboratories, Innovative Manufacturing Cooperative Research Centre, Sphere for Good, Australian Meat Processor Corporation,City of Casey, 460degrees and Passel.
